Application of Geophysical Techniques for Groundwater Investigation-A Case Study of Kadalundi River Basin, Malappuram, Kerala

Groundwater investigation has assumed top priority in recent years and geophysical method is vital in groundwater exploration. Thirty observation wells were selected and water level data monitored from bore wells and open wells. Monthly water level data for five years were obtained and analysed for the spatial and temporal variations of groundwater. There was no significant variation of water levels during the pre-monsoon and post-monsoon intervals in the basin. Vertical Electrical sounding method was adoptedusing Signal Stacking Resistivity Meter. VES survey was carried out in 22 locations of the Kadalundi river basin covering anarea of about 1122 km² with nine Schlumberger electrode configurations and thirteen Wenner electrode configurations. The apparent resistivity values obtained were interpreted with the help of ‘IPI2WIN’ software. The sounding curves are of A, H, K, Q, HK and KH types reulting in 34 layer sequence. Most parts of the study area are dominated by H type curve which indicate the presence of good quality groundwater.